Your question is Explain statistical significance to a layperson. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How would you explain statistical significance to a layman?
Answer this as a practical interview response for an online experiment. Explain the idea without jargon, distinguish statistical significance from business importance, and use a small illustrative example only if helpful.
Also describe how you would define the metric, choose an MDE, assess uncertainty, and decide whether an observed result supports a product change.